Probing the electrical and dielectric properties of polyaniline multi-walled carbon nanotubes nanocomposites doped in different protonic acids

2020 ◽  
Author(s):  
Sharon J. Paul ◽  
Bipin Kumar Gupta ◽  
Prakash Chandra
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Properties ◽  
Multi Walled Carbon Nanotubes ◽  
Electrical And Dielectric Properties ◽  
Walled Carbon Nanotubes ◽  
Protonic Acids

Study on Dielectric and Magnetic Properties of MWCNTs/Polyester Composites

2015 ◽  
Vol 815 ◽  
pp. 188-192
Author(s):  
Y.S. Lee ◽  
F. Malek ◽  
E.M. Cheng ◽  
Wei Wen Liu ◽  
Kok Yeow You ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Magnetic Properties ◽  
Dielectric Properties ◽  
Rectangular Waveguide ◽  
The Real ◽  
Multi Walled Carbon Nanotubes ◽  
Polyester Composites ◽  
Walled Carbon Nanotubes ◽  
Ku Band ◽  
Dielectric Conductivity

This paper is to study the dielectric properties, magnetic properties, and dielectric conductivity of Multi-walled carbon nanotubes (MWCNTs) and polyester (PE) composites. The composites with different amount of MWCNTs (5-15%) have been studied in the Ku-Band range (12.4-18 GHz). The rectangular waveguide (WR-62) was used to measure the dielectric properties and magnetic properties of the samples. The results show the dielectric properties and conductivity of MWCNTs/PE composites is increasing with the MWCNTs filler increases. The real part of dielectric properties values increase from 5.5 to 26.6 with increasing the MWCNTs loading from 5 % to 15 %. The increasing of MWCNTs filler in the MWCNTs/PE composites does not effects on magnetic properties, the real part and imaginary part of magnetic properties are approximate to 1 and 0. The highest conductivity of 15 % MWCNTs loading is reach to 11.02 (S/m) at 18 GHz. Keywords: composites, dielectric properties, magnetic properties, conductivity

Dielectric properties of vertically aligned multi-walled carbon nanotubes in the terahertz and mid-infrared range

2017 ◽  
Vol 51 (3) ◽  
pp. 034004 ◽  
Author(s):  
Mark D Thomson ◽  
Wissem Zouaghi ◽  
Fanqi Meng ◽  
Matthias M Wiecha ◽  
Kaneez Rabia ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Properties ◽  
Infrared Range ◽  
Mid Infrared ◽  
Multi Walled Carbon Nanotubes ◽  
Vertically Aligned ◽  
Walled Carbon Nanotubes

Electrical/dielectric properties and conduction mechanism in melt processed polyamide/multi-walled carbon nanotubes composites

Polymer ◽  
2009 ◽  
Vol 50 (21) ◽  
pp. 5103-5111 ◽  
Author(s):  
E. Logakis ◽  
Ch. Pandis ◽  
V. Peoglos ◽  
P. Pissis ◽  
J. Pionteck ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Properties ◽  
Conduction Mechanism ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Biodegradable Poly (lactic acid)/Poly (ethylene glycol) Reinforced Multi-Walled Carbon Nanotube Nanocomposite Fabrication, Characterization, Properties, and Applications

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 427 ◽  
Author(s):  
Ahmad Fahad Ahmad ◽  
Sidek Ab Aziz ◽  
Suzan Jabbar Obaiys ◽  
Mohd Hafiz Mohd Zaid ◽  
Khamirul Amin Matori ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Lactic Acid ◽  
Dielectric Properties ◽  
Electromagnetic Interference ◽  
Poly Lactic Acid ◽  
Shielding Effectiveness ◽  
Poly Ethylene Glycol ◽  
Multi Walled Carbon Nanotubes ◽  
Poly Ethylene ◽  
Walled Carbon Nanotubes

This paper presents the electromagnetic interference properties of multi-walled carbon nanotubes (MWCNTs) as a novel nano-reinforcement filler in poly (lactic acid) (PLA)/poly (ethylene glycol) (PEG) polymer matrix that was prepared via melt blending mode. Plasticization of PLA was first carried out by PEG, which overcomes its brittleness problem, in order to enhance its flexibility. A waveguide adapter technique was used to measure the dielectric properties ε r , and S-parameters reflection (S11) and transmission (S21) coefficients. The dielectric properties, microwave attenuation performances, and electromagnetic interference shielding effectiveness (EMISE) for all the material under test have been calculated over the full X-Band (8–12 GHz) due to its importance for military and commercial applications. The prepared samples were studied while using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transforms infrared spectroscopy (FTIR), mechanical properties measurements, as well as thermogravimetric analysis (TGA). The results showed that the dielectric properties increased with increased multi-walled carbon nanotubes (MWCNTs) filler, as well as the shielding effectiveness of the MWCNT/PLA/PEG nanocomposites increased with the increasing of MWCNTs. The highest SE total value was found to be 42.07 dB at 12 GHz for 4 wt.% filler content. It is also observed that the attenuation values of the nanocomposites increased with an increase in MWCNTs loading, as well as the power loss values for all of the samples increased with the increase in MWCNTs loading, except the amount of the transmitted wave through the nanocomposites.

Enhanced dielectric properties of polyamide 11/multi-walled carbon nanotubes composites

2015 ◽  
Vol 132 (40) ◽  
pp. n/a-n/a ◽  
Author(s):  
Yongzhong Huang ◽  
Lirong Tan ◽  
Shaodi Zheng ◽  
Zhengying Liu ◽  
Jianming Feng ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Properties ◽  
Polyamide 11 ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Polystyrene adsorbed multi-walled carbon nanotubes incorporated polymethylmethacrylate composites with modified percolation phenomena

MRS Advances ◽  
2017 ◽  
Vol 3 (1-2) ◽  
pp. 25-30
Author(s):  
Tajamal Hussain ◽  
Tayyaba Malik ◽  
Adnan Mujahid ◽  
Ghulam Mustafa
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Properties ◽  
Percolation Threshold ◽  
Ftir Spectroscopy ◽  
Electrical Parameters ◽  
Dispersion Process ◽  
Multi Walled Carbon Nanotubes ◽  
Percolation Phenomena ◽  
Lcr Meter ◽  
Walled Carbon Nanotubes

ABSTRACTExtensive work has been done on the modification of multi-walled carbon nanotubes (MWCNTs) to improve their characteristics. Here, polystyrene (PS) was adsorbed on the surface of MWCNTs by dispersion process, using toluene as medium. PS modified MWCNTs (PS-MWCNTs) have been dispersed in polymethylmethacrylate (PMMA) matrix to prepare composite, PS-MWCNTs/PMMA. It is expected that PS adsorbed at the surface of the MWCNTs will help in improving the interaction between MWCNTs and PMMA which results uniform and homogeneous dispersion of the former in later. Thus, synthesized composites were characterized by UV-Vis and FTIR spectroscopy to monitor the functionality of developed product. Electrical parameters including conductivity and dielectric properties were measured with the help of LCR meter. Electrical characters of the composites were explored by investigating the effect of contents of PS-MWCNTs on conductivity and dielectric properties. Percolation behaviour was examined and calculated value of percolation threshold was 0.1wt%.

scholarly journals Fibers of Thermoplastic Copolyamides with Carbon Nanotubes for Electromagnetic Shielding Applications

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5699
Author(s):  
Paulina Latko-Durałek ◽  
Povilas Bertasius ◽  
Jan Macutkevic ◽  
Juras Banys ◽  
Anna Boczkowska
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Properties ◽  
Electromagnetic Shielding ◽  
Broadband Dielectric Spectroscopy ◽  
Degree Of Orientation ◽  
Multi Walled Carbon Nanotubes ◽  
Nanocomposite Fibers ◽  
Melt Adhesives ◽  
Walled Carbon Nanotubes ◽  
Hot Melt

Polymer composites containing carbon nanofillers are extensively developed for electromagnetic shielding applications, where lightweight and flexible materials are required. One example of the microwave absorbers can be thermoplastic fibers fabricated from copolyamide hot melt adhesives and 7 wt % of multi-walled carbon nanotubes, as presented in this paper. A broadband dielectric spectroscopy confirmed that the addition of carbon nanotubes significantly increased microwave electrical properties of the thin (diameter about 100 μm) thermoplastic fibers. Moreover, the dielectric properties are improved for the thicker fibers, and they are almost stable at the frequency range 26–40 GHz and not dependent on the temperature. The variances in the dielectric properties of the fibers are associated with the degree of orientation of carbon nanotubes and the presence of bundles, which were examined using a high-resolution scanning microscope. Analyzing the mechanical properties of the nanocomposite fibers, as an effect of the carbon nanotubes addition, an improvement in the stiffness of the fibers was observed, together with a decrease in the fibers’ elongation and tensile strength.

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